apcsa questions
Consider the following code segment. int x; int y; x = 3; y = /* missing expression */; x = 1 + 2 * y; System.out.print(x); System.out.println(y); Which of the following can be used as a replacement for /* missing expression */ so that the code segment prints 94 ?
x + 1
Consider the following code segment. int a = 1; while (a <= 2) { int c = 1; while (/* missing condition */) { System.out.print("*"); c++; } a++; } The code segment is intended to print "******". Which of the following can be used to replace /* missing condition */ so that the code segment works as intended?
c <= 3
Consider the following code segment in which the int variables a and b have been properly declared and initialized. if (a < b) { a++; } else if (b < a) { b++; } else { a++; b++; } Which of the following code segments is equivalent to the code segment above?
if (a == b) { a++; b++; } else if (a < b) { a++; } else { b++; }
Which of the following statements assigns a random integer between 25 and 60, inclusive, to rn ?
int rn = (int) (Math.random() * 36) + 25;
Consider the following code segment, which is intended to set the Boolean variable inRange to true if the integer value num is greater than min value and less than max value. Otherwise inRange is set to false. Assume that inRange, num, min, and max have been properly declared and initialized. Which of the following values of num, min, and max can be used to show that the code does NOT work as intended?
num = 50, min = 50, max = 50
Consider the following expression. (3 + 4 == 5) != (3 + 4 >= 5) What value, if any, does the expression evaluate to?
true
In the following expression, j, k, and m are properly declared and initialized int variables. !((j == k) && (k > m)) Which of the following is equivalent to the expression above?
(j != k) || (k <= m)
In the following expression, sweet, salty, and sour are properly declared and initialized boolean variables. sweet && (salty || sour) Which of the following expressions is equivalent to the expression above?
(sweet && salty) || (sweet && sour)
Consider the following description of method adjust. public void adjust(double max, double min, double total, double n) - Displays the value of (total - max - min) / (n - 2.0) Consider the call adjust(25.0, 5.0, 60.0, 5.0), which appears in a method in the same class. What is printed as a result of the method call?
10.0
Consider the following method. public int mystery(int num) { int x = num; while (x > 0) { if (x / 10 % 2 == 0) return x; x = x / 10; } return x; } What value is returned as a result of the call mystery(1034) ?
103
Consider the following method. public int getTheResult(int n) { int product = 1; for (int number = 1; number < n; number++) { if (number % 2 == 0) product *= number; } return product; } What value is returned as a result of the call getTheResult(8) ?
48
Consider the following code segment. int val = 48; int div = 6; while ((val % 2 == 0) && div > 0) { if (val % div == 0) { System.out.print(val + " "); } val /= 2; div--; } What is printed when the code segment is executed?
48 12 6
Consider the following code segment. int a = 100; while (a > 1) { System.out.println("$"); a /= 2; } How many $'s are printed as a result of executing the code segment?
6
Consider the following code segment. String first = new String("duck"); String second = new String("duck"); String third = new String("goose"); if (first == second) { System.out.print("A"); } else if (second == third) { System.out.print("B"); } else if (first.equals(second)) { System.out.print("C"); } else if (second.equals(third)) { System.out.print("D"); } else { System.out.print("E"); } What is printed as a result of executing the code segment?
C
Consider the following code segments, which differ only in their loop header. Code Segment I for (int i = 0; i < 10; i++) { System.out.print( "*" ); } Code Segment II for (int i = 1; i <= 10; i++) { System.out.print( "*" ); } Which of the following best explains how the difference in the two loop headers affects the output?
The output of the code segments is the same because the loops in both code segments iterate 10 times.
Consider the following description of the Purchase class which includes one constructor and one method. public Purchase(double purchaseAmt, double taxAmt) - Constructs a Purchase object that represents a single purchase with purchase amount purchaseAmt and tax taxAmt. public void totalAmount()- Displays the sum of the purchase amount and the tax Assume that a Purchase object p has been properly declared and initialized. Which of the following code segments will successfully print the total purchase amount associated with p?p.totalAmount();
p.totalAmount();
Consider the following class definition. public class Example { private int x; // Constructor not shown. } Which of the following is a correct header for a method of the Example class that would return the value of the private instance variable x so that it can be used in a class other than Example ?
public int getX()
Consider the following method. /* missing precondition */ public void someMethod(int j, int k, String oldString) { String newString = oldString.substring(j, k); System.out.println("New string: " + newString); } Which of the following is the most appropriate precondition for someMethod so that the call to substring does not throw an exception?
/* Precondition: 0 <= j <= k <= oldString.length() */
The method addItUp(m, n) is intended to print the sum of the integers greater than or equal to m and less than or equal to n. For example, addItUp(2, 5) should return the value of 2 + 3 + 4 + 5. /* missing precondition */ public static int addItUp(int m, int n) { int sum = 0; for (int j = m; j <= n; j++) { sum += j; } return sum; } Which of the following is the most appropriate precondition for the method?
/* Precondition: m <= n */
Consider the following code segment. String str = "AP-CSA"; for (int i = 0; i < str.length(); i++) { if (str.substring(i, i + 1).equals("A")) { System.out.print(i + " "); } } What is printed as a result of executing the code segment?
0 5
Consider the following code segment. int j = 1; while (j <= 5) { for (int k = 4; k > 1; k--) { System.out.println("ha"); // line 6 } j++; } How many times will the print statement on line 6 execute?
15
Consider the code segment below. int x = 10; int y = 20; System.out.print(y + x / y); What is printed as a result of executing the code segment?
20
Consider the following code segment. int a = 1; int b = 2; int c = 3; int d = 4; double x = a + b * c % d; What is the value of x when the code segment has been executed?
3.0
Consider the following code segment. for (int k = 0; k < 20; k = k+2) { if (k %3 == 1) { System.out.print(k + " ");} } What is printed as a result of executing the code segment?
4 10 16
Consider the following code segment. int count = 0; int number = 20; while (number > 0) { number = number / 2; count++; } What will be the value of count after executing the code segment?
5
Consider the following descriptions of two methods, which appear in the same class. public void methodA(int arg) - Calls methodB with the value of arg * 10 public void methodB(int arg) - Displays the value of arg + 10 Consider the call methodA(4), which appears in a method in the same class. What, if anything, is printed as a result of the call methodA(4)?
50
Consider the following method. public int pick(boolean test, int x, int y) { if (test) return x; else return y; } What value is returned by the following method call? pick(false, pick(true, 0, 1), pick(true, 6, 7))
6
Consider the following code segment. int quant = 20; int unitPrice = 4; int ship = 8; int total; if (quant > 10) { unitPrice = 3; } if (quant > 20) { ship = 0; } total = quant * unitPrice + ship; What is the value of total after this code segment has been executed?
68
Consider the following code segment. int k = 35; while (k >= 0) { System.out.println("X"); k -= 5; } How many times will the string "X" be printed as a result of executing the code segment?
8
The following code segment prints one or more characters based on the values of boolean variables b1 and b2. Assume that b1 and b2 have been properly declared and initialized. if (!b1 || b2) { System.out.print("A"); } else { System.out.print("B"); } if (!(b1 || b2)) { System.out.print("C"); } else { System.out.print("D"); } if (b1 && !b1) { System.out.print("E"); } If b1 and b2 are both initialized to true, what is printed when the code segment has finished executing?
AD
A student has created a Book class. The class contains variables to represent the following. An int variable called pages to represent the number of pages A boolean variable called isHardcover to indicate whether or not the book is hardcover The object story will be declared as type Book. Which of the following descriptions is accurate?
An attribute of the story object is isHardcover
Consider the following code segment. System.out.print("Ready"); // Line 1 System.out.print("Set"); // Line 2 System.out.print("Go!"); // Line 3 The code segment is intended to produce the following output but may not work as intended. Ready Set Go! Which change, if any, can be made so that the code segment produces the intended output?
Changing print to println in lines 1 and 2
Consider the following two code segments. Assume that variables x and y have been declared as int variables and have been assigned integer values. I. int result = 0; if (x > y) { result = x - y; System.out.print(result); } else if (x < y) { result = y - x; System.out.print(result); } else { System.out.print(result); } II. if (x < y) { System.out.print(y - x); } else { System.out.print(x - y); } Which of the following correctly compares the outputs of the two code segments?
Code segment I and code segment II produce the same output for all values of x and y.
Consider the following code segment. System.out.println(hello); // Line 1 System.out.print(world); // Line 2 The code segment is intended to produce the following output but does not work as intended. hello world Which of the following changes can be made so that the code segment produces the intended output?
Enclosing hello in line 1 and world in line 2 in quotation marks
Consider the following class definition. Each object of the class Employee will store the employee's name as name, the number of weekly hours worked as wk_hours, and hourly rate of pay as pay_rate. public class Employee { private String name; private int wk_hours; private double pay_rate; public Employee(String nm, int hrs, double rt) { name = nm; wk_hours = hrs; pay_rate = rt; } public Employee(String nm, double rt) { name = nm; wk_hours = 20; pay_rate = rt; } } Which of the following code segments, found in a class other than Employee, could be used to correctly create an Employee object representing an employee who worked for 20 hours at a rate of $18.50 per hour? I. Employee e1 = new Employee("Lili", 20, 18.5); II. Employee e2 = new Employee("Steve", 18.5); III. Employee e3 = new Employee("Carol", 20);
I and II only
Consider the following description of method min. public int min(int first, int second) - Returns the lesser of its two parameters. Assume that each of the following expressions appears in a method in the same class as the method min. Assume also that the int variables p, q, and r have been properly declared and initialized. Which of the following expressions evaluates to the minimum value among p, q, and r? I. min(min(p, q), r) II. min(p, min(q, r)) III. min(min(p, q), p)
I and II only
Consider the following description of the Vbox class which includes two constructors. public Vbox(int w, int h, int d) - Constructs a Vbox object that represents a box with width w, height h, and depth d. public Vbox(int len) - Constructs a Vbox object that represents a box with width len, height len, and depth len. Which of the following declarations, appearing in a method in a class other than Vbox, will correctly instantiate a Vbox object? I. Vbox b1 = new Vbox(4); II. Vbox b2 = new Vbox(2, 8, 4); III. Vbox b3 = new Vbox(4.0, 4.0, 4.0);
I and II only
At a certain high school students receive letter grades based on the following scale. Which of the following code segments will assign the correct string to gradefor a given integer score ?
I and III only
Each of the following code segments is intended to print the word Hello. Which of the following code segments works as intended? I. System.out.print("Hello"); II. System.out.print(Hello); III. System.out.print(He); System.out.print(llo);
I only
In the code segment below, the int variable temp represents a temperature in degrees Fahrenheit. The code segment is intended to print a string based on the value of temp. The following table shows the string that should be printed for different temperature ranges. Which of the following test cases can be used to show that the code does NOT work as intended? I. temp == 30 II. temp == 51 III. temp == 60
I only
Consider the following description of the MagicNumber class which includes one constructor and two methods. public MagicNumber()- Constructs a MagicNumber object that represents a number public void displayNumber()- Displays the number to the screen public void add_2()- Increases the number by 2 When located in a method in a class other than MagicNumber, which of the following code segments will compile without error? I. MagicNumber.add_2(); MagicNumber.displayNumber(); II MagicNumber n1 = new MagicNumber();n1.add_2(); n1.=displayNumber(); III. n2.add_2(); n2.displayNumber();
II only
Consider the following code segment where num is a properly declared integer initialized to a positive value. int total = 0; while (num > 0) { total += num % 10; num /= 10; } Which of the following code segments could replace the while loop without changing the resulting value of total? I. for (int h = 0; h < num; h++) { total += num % 10; num /= 10; } II. for (int j = num; j > 0; j--) { total += j % 10; } III. for (int k = num; k > 0; k /= 10) { total += k % 10; }
III only
Which of the following best describes the value of the Boolean expression shown below? a && !(b || a)
The value is always false.
Consider the following code segment: /* data type 1 */ x = 0.5; /* data type 2 */ y = true; Which of the following best describes the data types that should be used to replace/* data type 1 */ and /* data type 2 */ so that the code segment compiles without error?
The variable x should be declared as a double and the variable y should be declared as a boolean.
Consider the following code segment. System.out.println("W"); System.out.println("X"); System.out.print("Y"); System.out.print("Z"); What is printed as a result of executing the code segment?
W X YZ
Consider the following variable declarations and initializations. int a = 2; int b = 6; int c = 3; Which of the following expressions evaluates to false ?
a < b != c < b
Consider the following code segment. int a = 1; int b = 0; int c = -1; if ((b + 1) == a) { b++; c += b; } if (c == a) { a--; b = 4; } What are the values of a, b, and c after this code segment has been executed?
a = 1, b = 1, and c = 0
Assume that the int variables a, b, c, and low have been properly declared and initialized. The code segment below is intended to print the sum of the greatest two of the three values but does not work in some cases. For which of the following values of a, b, and c does the code segment NOT print the correct value?
a = 3, b = 2, c = 1
Consider the following code segment. System.out.print("cat "); System.out.println("dog "); System.out.println("horse "); System.out.print("cow "); What is printed as a result of executing the code segment?
cat dog horse cow
Consider the following code segment. String word = "computer"; int num = 3; String result = ""; for (int k = num; k >= 0; k--) { result += word.substring(0, k); } System.out.print(result); What is printed as a result of executing the code segment?
comcoc
Consider the following code segment, which uses properly declared and initialized int variables x and y and the String variable result. String result = ""; if (x < 5) { if (y > 0) { result += "a"; } else { result += "b"; } } else if (x > 10) { if (y < 0) { result += "c"; } else if (y < 10) { result += "d"; } result += "e"; } result += "f"; What is the value of result after the code segment is executed if x has the value 15 and y has the value 5 ?
def
Consider the following description of method fahrenheitToCelsius. public double fahrenheitToCelsius(double f) - Takes as input a temperature in degrees Fahrenheit and returns the corresponding temperature in degrees Celsius. Assume that each of the following code segments appears in a method in the same class as fahrenheitToCelsius. Which of the following code segments prints the temperature in degrees Celsius that corresponds to 32 degrees Fahrenheit?
double f = 32.0; double c = fahrenheitToCelsius(f); System.out.println(c);
Which statement correctly declares a variable that can store a temperature rounded to the nearest tenth of a degree?
double patientTemp;
Consider the following secret method. public double secret(int x, double y) Which of the following lines of code, if located in a method in the same class as secret, will compile without error?
double result = secret(4, 4.0);
Consider the following code segment. for (int k = 0; k < 4; k++) { /* missing loop header */ { System.out.print(k); } System.out.println(); } The code segment is intended to produce the following output. 0 11 222 3333 Which of the following can be used to replace /* missing loop header */ so that the code segment will work as intended?
for (int h = k; h >= 0; h--)
Consider the following output. 1 1 1 1 1 2 2 2 2 3 3 3 4 4 5 Which of the following code segments will produce this output?
for (int j = 1; j <=5; j ++) { for (int k = 5; k >= j; k --) { System.out.print(j + " ");} System.out.println(); }
Consider the following code segment. int total = 0; for (int k = 0; k <= 100; k += 2) { total += k; } Which of the following for loops could be used to replace the for loop in the original code segment so that the original and the revised code segments store the same value in total?
for (int k = 1; k <= 101; k += 2) { total += k - 1; }
A teacher has created a Student class. The class contains the following. An int variable called grade to represent the student's grade level A String variable called name to represent the student's name A double variable called average to represent the student's grade point average A method called updateAverage that updates the student's average. The object greg will be declared as type Student. Which of the following descriptions is accurate?
greg is an instance of the Student class
Directions: Select the choice that best fits each statement. The following question(s) refer to the following incomplete class declaration. public class TimeRecord { private int hours; private int minutes; public TimeRecord(int h, int m) { hours = h; minutes = m; }
hours = hours + minutes / 60; minutes = minutes % 60;
A teacher determines student percentages in a course as the points a student earns divided by the total points available in the grading period. Points are awarded only in whole number increments, but student percentages are to be stored as decimals. The following code segment appears in a program used to compute student percentages. Points that a student earns are stored in pointsEarned, the total points available in the grading period are stored in totalPoints, and the student percentage is stored in percentage. int pointsEarned; /* missing code */ Which of the following is most appropriate to replace /* missing code */ in the program?
int totalPoints; double percentage;
Consider the following description of the AnimalPrinter class which includes two methods. public void printDog()- Displays the word "dog" and then moves the cursor to a new line public void printCat()- Displays the word "cat" and then moves the cursor to a new line The method myMethod appears in a class other than AnimalPrinter. The method is intended to produce the following output. dog cat Assume that an AnimalPrinter object myPrinter has been properly declared and initialized inside myMethod. Which of the following code segments, if located in myMethod, will produce the intended output?
myPrinter.printDog(); myPrinter.printCat();
The Thing class below will contain a String attribute, a constructor, and the helper method, which will be kept internal to the class. public class Thing { /* missing code */ } Which of the following replacements for /* missing code */ is the most appropriate implementation of the class?
private String str; public Thing(String s) { /* implementation not shown */ } private void helper() { /* implementation not shown */ }
Consider the following description of the Thing class which includes two constructors. public Thing () - Constructs a Thing object that uses a default value to represent a color public Thing(String setColor) - Constructs a Thing object that uses setColor to represent a color Which of the following code segments, when appearing in a class other than Thing, will create an instance variable of a Thing object with a value of null?
private Thing someThing;
The Fraction class below will contain two int attributes for the numerator and denominator of a fraction. The class will also contain a method fractionToDecimal that can be accessed from outside the class. public class Fraction { /* missing code */ // constructor and other methods not shown } Which of the following replacements for /* missing code */ is the most appropriate implementation of the class?
private int numerator; private int denominator; public double fractionToDecimal() { return (double) numerator / denominator; }
Consider the following class definition. public class Person { private String name; /* missing constructor */ } The statement below, which is located in a method in a different class, creates a new Person object with its attribute name initialized to "Washington". Person p = new Person("Washington"); Which of the following can be used to replace /* missing constructor */ so that the object p is correctly created?
public Person(String n) { name = n; }
The Employee class will contain a String attribute for an employee's name and a double attribute for the employee's salary. Which of the following is the most appropriate implementation of the class?
public class Employee { private String name; private double salary; // constructor and methods not shown }
Consider the following methods. public void changer (String x, int y) {x = x + "peace"; y = y *2; } public void test() { String s = "world"; int n = 6; changer (s, n); } When the call test ( ) is executed, what are the values of s and n at the point indicated by / * End of method * / ?
s / n world / 6
Consider the following code segment. boolean a = true; boolean b = false; System.out.print((a == !b) != false); What is printed as a result of executing this code segment?
true
Consider the following code segment. String myString = new String("my string"); String yourString = new String(); yourString = "my string"; boolean dotEquals = myString.equals(yourString); boolean equalsEquals = (myString == yourString); System.out.print(dotEquals + " " + equalsEquals); What is printed as a result of executing the code segment?
true false
Consider the following code segment. boolean a = true; boolean b = true; System.out.print((b || (!a || b)) + " "); System.out.print(((!b || !a) && a) + " "); System.out.println(!(a && b) && b); What output is produced when this code segment is executed?
true false false
In the following expression, sunny and windy are properly declared and initialized boolean variables. !sunny && !windy Which of the following is equivalent to the expression above?
!(sunny || windy)
Consider the following code segment. int a = 5; int b = 2; double c = 3.0; System.out.println(5 + a / b * c - 1); What is printed when the code segment is executed?
10.0
Consider the following class definition, which represents two scores using the instance variables score1 and score2. The method reset is intended to set to 0 any score that is less than threshold. The method does not work as intended. public class TestClass { private int score1; private int score2; public TestClass(int num1, int num2) { score1 = num1; score2 = num2; } public void reset(int threshold) { if (score1 < threshold) // line 14 { score1 = 0; // line 16 } else if (score2 < threshold) // line 18 { score2 = 0; } } } Which of the following changes can be made so that the reset method works as intended?
In line 18, change else if to if.
Consider the following definition of the class Student. public class Student { private int grade_level; private String name; private double GPA; public Student (int lvl, String nm, double gr) { grade_level = lvl; name = nm; GPA = gr; } } Which of the following object initializations will compile without error?
Student max = new Student (10, "Max", 3.75);
Consider the following code segment, which is intended to store the sum of all multiples of 10 between 10 and 100, inclusive (10 + 20 + ... + 100), in the variable total. int x = 100; int total = 0; while( /* missing code */ ) { total = total + x; x = x - 10; } Which of the following can be used as a replacement for /* missing code */ so that the code segment works as intended?
x >= 10
Assume that the boolean variables a, b, c, and d have been declared and initialized. Consider the following expression. !( !( a && b ) || ( c || !d )) Which of the following is equivalent to the expression?
( a && b ) && ( !c && d )
Consider the following code segment. int a = 1; String result = ""; while (a < 20) { result += a; a += 5; } System.out.println(result); What, if anything, is printed as a result of executing the code segment?
161116
Consider the following code segment. int x = 10; int y = 20; /* missing code */ System.out.print(top / bottom); Which of the following replacements for /* missing code */ will cause an ArithmeticException to occur? I. int top = x - y;int bottom = y - x; II. int top = 2 * x;int bottom = y - top; III. int top = x + y;int bottom = 2 * top;
II only
Consider the following code segment. int n = 6; for (int i = 1; i < n; i = i + 2) // Line 2 { System.out.print(i + " "); } Which of the following best explains how changing i < n to i <= n in line 2 will change the result?
There will be no change to the program output because the loop will iterate the same number of times.
Consider the following class. public class Help { private int h; public Help(int newH) { h = newH; } public double getH() { return h; } } The getH method is intended to return the value of the instance variable h. The following code segment shows an example of creating and using a Help object. Help h1 = new Help(5); int x = h1.getH(); System.out.println(x); Which of the following statements best explains why the getH method does not work as intended?
The getH method should have a return type of int.
Consider the following class declaration. public class Student { private String name; private int age; public Student(String n, int a) { name = n; age = a; } public boolean isOlderThan5() { if (age > 5) { return true; } } } Which of the following best describes the reason this code segment will not compile?
The isOlderThan5 method is missing a return statement for the case when age is less than or equal to 5.
Consider the following code segment. for (int j = 0; j < 4; j++) { for (int k = 0; k < j; k++) { System.out.println("hello"); } } Which of the following best explains how changing the inner for loop header to for (int k = j; k < 4; k++) will affect the output of the code segment?
The string "hello" will be printed four additional times because the inner loop will iterate one additional time for each iteration of the outer loop.
Consider the processWords method. Assume that each of its two parameters is a String of length two or more. public void processWords(String word1, String word2) { String str1 = word1.substring(0, 2); String str2 = word2.substring(word2.length() - 1); String result = str2 + str1; System.out.println(result.indexOf(str2)); } Which of the following best describes the value printed when processWords is called?
The value 0 is always printed.
Consider the following description of the VetRecord class which includes two constructors. public VetRecord(String name, int age, int weight, boolean needsVac) - Constructs a VetRecord object that represents a vet record for a pet with name name, age age, weight weight, and whether they need to be vaccinated needsVac. public VetRecord(String name, int age, int weight) - Constructs a VetRecord object that represents a vet record for a pet with name name, age age, and weight weight. A new constructor is to be added to the VetRecord class. Which of the following is NOT a possible header for the new constructor?
VetRecord(String name, int weight, int age)
Consider the following code segment. String str1 = new String("Happy"); String str2 = new String("Happy"); System.out.print(str1.equals(str2) + " "); System.out.print(str2.equals(str1) + " "); System.out.print(str1 == str2); What is printed as a result of executing the code segment?
true true false
Consider the following method substringFound, which is intended to return true if a substring, key, is located at a specific index of the string phrase. Otherwise, it should return false. public boolean substringFound(String phrase, String key, int index) { String part = phrase.substring(index, index + key.length()); return part.equals(key); } Which of the following is the best precondition for index so that the method will return the appropriate result in all cases and a runtime error can be avoided?
0 <= index <= phrase.length() - key.length()
Consider the following code segment. int m = 8; int n = 3; if (m + n > 10) { System.out.print(m + n); } if (m - n > 0) { System.out.print(m - n); } What, if anything, is printed as a result of executing the code segment?
115
Vehicles are classified based on their total interior volume. The classify method is intended to return a vehicle classification String value based on total interior volume, in cubic feet, as shown in the table below. The classify method, which does not work as intended, is shown below. public static String classify(int volume) { String carClass = ""; if (volume >= 120) { carClass = "Large"; } else if (volume < 120) { carClass = "Mid-Size"; } else if (volume < 110) { carClass = "Compact"; } else if (volume < 100) { carClass = "Subcompact"; } else { carClass = "Minicompact"; } return carClass; } The classify method works as intended for some but not all values of the parameter volume. For which of the following values of volume would the correct value be returned when the classify method is executed?
115
Consider the following code segment. String temp = "Mississippi"; String part = "si"; int position = 0; int count = 0; while(temp.indexOf(part) >= 0) { position = temp.indexOf(part); count++; temp = temp.substring(position + 1); } System.out.println(count); What, if anything, is printed as a result of executing the code segment?
2
A school administrator has created a Student class. The class contains variables to represent the following. An int variable called studentID to represent the student's ID number A String variable called studentName to represent the student's name The school administrator has also created a Parent class. The class contains variables to represent the following. A String variable called parentName to represent the parent's name A String variable called email to represent the parent's e-mail address The object penelope will be declared as type Student. The object mrsPatel will be declared as type Parent. Which of the following descriptions is accurate?
An attribute of the mrsPatel object is email
Consider the following two code segments, which are both intended to determine the longest of the three strings "pea", "pear", and "pearl" that occur in String str. For example, if str has the value "the pear in the bowl", the code segments should both print "pear" and if str has the value "the pea and the pearl", the code segments should both print "pearl". Assume that str contains at least one instance of "pea". Which of the following best describes the output produced by code segment I and code segment II?Code segment II produces correct output for all values of str, but code segment I produces correct output only for values of str that contain "pea" but not "pear".
Code segment II produces correct output for all values of str, but code segment I produces correct output only for values of str that contain "pea" but not "pear".
Consider the class definition below. The method levelUp is intended to increase a Superhero object's strength attribute by the parameter amount. The method does not work as intended. public class Superhero { private String name; private String secretIdentity; private int strength; public Superhero(String realName, String codeName) { name = realName; secretIdentity = codeName; strength = 5; } public int levelUp(int amount) // line 14 { strength += amount; // line 16 } } Which of the following changes should be made so that the levelUp method works as intended?
In line 14, levelUp should be declared as type void.
Consider the following class definition. The method appendIt is intended to take the string passed as a parameter and append it to the instance variable str. For example, if str contains "week", the call appendIt("end") should set str to "weekend". The method does not work as intended. public Class StringThing { private String str; public StringThing(String myStr) { str = myStr; } public void appendIt(String s) // line 10 { str + s; // line 12 } } Which of the following changes should be made so that the appendIt method works as intended?
Line 12 should be changed to str = str + s;.
Consider the following code segment. for (int i = 0; i < 5; i++) // Line 1 { for (int j = 0; j < 5; j++) { int k = i + j; System.out.print(k + " "); } } Which of the following best describes the result of changing i < 5 to i > 5 in line 1?
Nothing will be printed because the body of the outer for loop will not execute at all.
Consider the following class definition. public class Pet { private String name; private int age; public Pet(String str, int a) { name = str; age = a; } public getName() { return name; } } Which choice correctly explains why this class definition fails to compile?
The accessor method is missing a return type.
Consider the following description of method printSomething. public void printSomething(int num, boolean val) - Displays the value of val immediately followed by the value of num - 1 Consider the following code segment, which appears in a method in the same class as printSomething. printSomething(1, true); printSomething(2, true); What is printed as a result of executing the code segment?
true0true1
Consider the following incomplete code segment, which is intended to print the sum of the digits in num. For example, when num is 12345, the code segment should print 15, which represents the sum 1 + 2 + 3 + 4 + 5. int num = 12345; int sum = 0; /* missing loop header */ { sum += num % 10; num /= 10; } System.out.println(sum); Which of the following should replace /* missing loop header */ so that the code segment will work as intended?
while (num > 0)